Patents by Inventor Shigeru Hatano

Shigeru Hatano has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High harmonic current reducing apparatus in power converter
    Patent number: 4122515
    Abstract: This invention is applied to a power converter with a converting apparatus comprising one or more units including only controlled rectifiers or combination of controlled rectifiers and non-controlled rectifiers, said converting apparatus being connected with an AC power source, whereby high harmonic currents generated in the AC circuit during commutating periods are reduced.In the present invention, at the commutating period of the converting apparatus, the reactance in the AC circuit of the converter is changed to increase in accordance with change of the AC current of the converting apparatus, so that the change of the AC current during the commutating period is made more slowly thereby reducing high harmonic currents.
    Type: Grant
    Filed: February 11, 1976
    Date of Patent: October 24, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Kyozo Tachibana, Takashi Tsuboi, Yutaka Suzuki, Mitsugu Matsutake, Shozuchi Miura, Shigeru Hatano, Takao Goto, Yoshio Nozaki